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Income Taxes (Components of Income Before Taxes and of Income Tax Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes |  |  |
United States | $ 55,117 | $ 35,050 | $ 21,634
Foreign | 1,157 | 961 | 2,312
Income before income taxes | 56,274 | 36,011 | 23,946
Federal |  |  |
Current |  | (58) | 324
Deferred | 12,871 | (31,198) | 8,807
Total | 12,871 | (31,256) | 9,131
State |  |  |
Current | 364 | 284 | 14
Deferred | (814) | 4,805 | 292
Total | (450) | 5,089 | 306
Foreign |  |  |
Current | 622 | 20 | 440
Total | 622 | 20 | 440
Total |  |  |
Current | 986 | 246 | 778
Deferred | 12,057 | (26,393) | 9,099
Total | 13,043 | (26,147) | 9,877
Reconciliation of the federal income tax expense at the statutory rate to the effective income tax expense |  |  |
Statutory federal income tax expense | 11,818 | 12,244 | 8,142
State taxes, net of federal benefit | (526) | 3,360 | 202
Foreign tax paid | 622 | 20 | 440
Change in federal tax rate |  | (43,643) |
Tax consequences of the sale of engines to WMES |  | 164 |
Uncertain tax positions |  |  | (40)
Permanent differences-nondeductible executive compensation | 1,144 | 1,238 | 1,201
Permanent differences and other | (15) | 470 | (68)
Total | $ 13,043 | $ (26,147) | $ 9,877
Reconciliation of the federal income tax expense |  |  |
Statutory federal income tax expense (as a percent) | 21.00% | 35.00% |

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- Definition Represents the portion of the difference between total income tax expense or benefit as reported in the income statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to the pretax income from continuing operations, which is attributable to permanent differences and other items. + References No definition available. + Details
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Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the portion of the difference between total income tax expense or benefit as reported in the income statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to the pretax income from continuing operations attributable to permanent differences from IRS section 162(m). + References No definition available. + Details
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Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the portion of the difference between total income tax expense or benefit as reported in the income statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to the pretax income from continuing operations, which is attributable to tax consequences of the sale of equipment. + References No definition available. + Details
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Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration